Augers often leave residual feed (shaded areas) in their housing because the screws must have clearance as shown in figure 1.

Movement of feed out of a bin occurs directly above the discharge point. The remaining feed then cascades down the slope of the crater that is subsequently formed (fig 2). Failure to completely empty bins before refilling will result in residual feed retained in the bin (fig 3)

Figure 3 demonstrates the typical feed flow in a feed bin with the shaded areas illustrating where the feed is most likely to remain and contaminate the next batch

Detection of mites

Mites are not visible to the naked eye

They may be detected as pink/brown "dust" at the base of bins.

If you suspect mites, pinch the "dust" into a peak. If live mites are present the peak will soon collapse.

Some mites have a distinctive smell which is often more evident if the "dust" is rubbed between the fingers.

Bagged Feed

Storage

Cool and dry, below 18?C

On pallets, not on the floor

Away from strong smelling products such as oil or disinfectants

Bags should be stock controlled, always use the oldest deliveries first

Store should be vermin proof. Ensure all feed barrows are covered at all times.